Approximate ages: Small/Medium (3-5 yrs. old) / Large/X-Large (4-6 yrs. old) Sizing Guide (waist in inches): Small/Medium: 17-19 / Large/X-Large: 19-21 Body-fit long pants. 4 Ways stretch compression. Hook/loop grip tabs to hold up socks. Machine washable and highly durable. Allows unhindered movement and keeps the cup in place (cup included).